Some mammals can have a black, pink or spotted skin, depending on race - see for example humans or pigs. But I recently learned that this is not the case with mice. Even black furred mice have pink ...

I have read in some texts that diabetes mellitus type 1 is caused by degeneration of beta cells due to our body's own immune reaction.Is it true? Can you explain further how are such types of immune ...

A drone bee is male and is the product of only a queen bee. How is it that the drone bee can be male. I know that a drone is produced by an unfertilized egg, but this does not explain where the two X ...

The mass and size of the dinosaurs and prehistoric insects continues to amaze me. I read from an earlier post that oxygen was more abundant during the prehistoric era. However supporting the weight ...

After researching why humans have white scleras when most primates have dark scleras, I stumbled upon the cooperative eye hypothesis. It proposed that white scleras may have evolved on behalf that it ...

Often do I hear people speaking of how the domestic house cats are more friendly, less ferocious, less savage-like, and smarter and/or than their distinct but equivalent feline-species friends, like ...

I would like to know if it's possible for a human to acquire an animal memory.
I mean, animals store their memories in their brain, right? And so do we, humans, store our memory.
So, is it possible ...

I noticed that my cat which is only 6 months old has started stretching its body from time to time. Then I thought that this motion doesn't seem very natural from another cat's viewpoint, so my cat ...

I have long had the idea, and I think I've also hear it on TV, that insects could be descendants from organisms arriving Earth with meteors.
The inside difference between insects and other animals is ...

When I was moving to another house, I found this plastic bag on the top of the cabinet of my old house. It looks like someone cut it all with a scissor, but no one have access to my bedroom, and it ...

When I was young, I was told never to put a fluorescent light in a hen house because it continuously turns on and off. Extra lighting is used, as far as I know, to 'extend' a chicken's day. Human eyes ...

Poachers are only after the ivory horns right? I read this story from the New York Times ( I think) of saving a Rhinocerous by some Park Rangers and a Vet. ( forgive spelling) ; they tranquilized the ...

The biggest and heaviest aquatic animal is the blue whale: 30 meters long and a mass of 200 tonnes.
The biggest and heaviest terrestrial animal was a Sauropod (plant-eating, long-necked dinosaur): 40 ...

I hesitated to ask this question because it seems so obvious and intuitive. However, I am not able to explain this tendency.
Background
It seems to me that small organisms make faster movements than ...

For a human, when diving underwater, everything is blurry because of the water's different refractive index compared to that of air, which we are accustomed to. How do animals, like turtles, seals or ...

I remember being told as a child that dogs stick their tongue out to stay cool, because they can't sweat like us. This made sense to me.
But only a couple of days ago I suddenly thought: What about ...

There are several species of plant eaters that have a very visible bright white behind: several kinds of deer, rabbits, antelopes, etc.
Does this white spot have any function to it, or is it purely ...

I recently had ants find and then swarm to a food container that I put down on a desk, and I'm curious as to whether an ant would have needed to get lucky, discovering the food after crawling up the ...

I read a lot of articles on the internet about how dog see the the world. But I can't find the source of these study. I want to know how did scientist setup the experiment to find out animal vision. I ...

Super simple question, but I can't find the answer on the Internet (and I'm in a foreign country so the library is not English.) As the title says, what is the smallest scale at which blood vessels, ...